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Date: Wed, 11 Oct 2006 09:39:28 -0700
From: Doug Cutting <cutting@apache.org>
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To: hadoop-user@lucene.apache.org
Subject: Re: Formatting the Namenode
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This refers to formatting Hadoop's DFS filesystem, not formatting a 
linux volume.  Hadoop's DFS filesystem in implemented on top the local 
filesystems of your cluster.  Hadoop does not require reformatting of 
linux filesystem volumes.  Formatting a Hadoop DFS filesystem simply 
creates a few files and directories in a configured location on your 
local filesystem (removing any files that already existed there).

Does that make more sense?

Doug

howard chen wrote:
> hello all,
> 
> from the page:
> 
> http://wiki.apache.org/lucene-hadoop/GettingStartedWithHadoop
> 
> The first step to starting up your Hadoop installation is formatting
> the file system. You need to do this the first time you set up a
> Hadoop installation. Do not format a running file system, this will
> cause all your data to be erased. To format the file system, run the
> command:
> 
> i am confused by the instruction there...is that mean
> 
> 1. I need to make an empty partition for hadoop first, without 
> formatting it?
> 
> 2. Is that mean haoop will only run on Linux as the file system can't
> be supported by windows?
> 
> 3. are there any complete step by step tutorial for newbie?
> 
> thanks.